function initialize() {
  var mapDiv = document.getElementById('map-canvas');
  var map = new google.maps.Map(mapDiv, {
    center: new google.maps.LatLng(37.4419, -122.1419),
    zoom: 13,
    mapTypeId: google.maps.MapTypeId.ROADMAP
  });

  var marker = new google.maps.Marker({
    position: map.getCenter(),
    map: map
  });

  var infoWindow = new google.maps.InfoWindow({
    content: '<img src="http://www.google.com/events/io/2011/static/img/bootcamp.png">'
  });

  google.maps.event.addListener(marker, 'click', function() {
    infoWindow.open(map, marker);
  });
}
